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Abdullah Muhammad,Alharbi Fatemah Farraj,Khosa Rabia Yasmin,Alburaih Huda A.,Manzoor Sumaira,Abid Abdul Ghafoor,Ali Haitham Elhosiny,Waheed Muhammad Suleman,Ansari Muhammad Numair,Farid Hafiz Muhammad 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
Manganese ferrite offers several advantages when employed as an electrocatalytic material for supercapacitors, including outstanding cycle stability and energy capacity. When compared to identical-metal sulfides, specific capacitance (Csp) of MnFe2O4 remains inadequate. So, using the hydrothermal synthesis technique, partial sulfur doping of MnFe2O4 was achieved to investigate the synergetic effect of oxides and sulfides. Various spectroscopic and microscopic studies demonstrate that adding sulfur atoms into MnFe2O4 increases the lattice parameters, which improves electrochemical performance. At a current density around 2 A g−1, then calculating MnFe2O4 with partial sulfur doping has a Csp of 1,201.60 F g−1, that is greater than 784.0 F g−1 of pure MnFe2O4. Maximum energy density (Ed) of 93.62 Wh kg−1 was produced with a power density (Pd) of 749 W kg−1. The current study depicts that partial sulfur doping can enhance the electrochemical behavior of MnFe2O4. As a result, the present work shows more effective in field of energy storage by enhancing their poor electrochemical performance.
The electrical, dielectric and magnetic effect of MgFe2O4–polypyrrole and its composites
Alburaih H. A.,Khan Sajjad Ahmad,Khosa Rabia Yasmin,Ejaz Syeda Rabia,Khan Abdul Rauf,Muhammad Ghulam,Waheed Muhammad Suleman,Chughtai Adeel Hussain,Manzoor Sumaira,Aman Salma 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
In the modern world of health and life sciences, the utilization of nanoscale materials, particularly magnetic nanoparticles, is a hot topic. Here in the present study, MgFe2O4 is synthesized via the chemical co-precipitation technique, and the polypyrrole (PPy) is fabricated via in situ polymerization technique to form the MgFe2O4/PPy nanocomposite by varying its content in the ferrite material. The electrical, magnetic, and dielectric properties of the fabricated materials were studied to investigate their applications in electronic devices. The magnetization saturation Ms, remanence Mr and coercivity Hc increase with the addition of ferrite material. The activation of the fabricated material increases from 0.11 to 0.34 eV, indicating the increase in electrical resistivity. The other important parameters such as squareness ratio and drift mobility were also calculated. The increment in DC electrical resistivity, saturation magnetic magnetization and remanence as well as reduction in dielectric constant values with the ferrite material addition in the polypyrrole suggest that the materials can be beneficial for recording media as well as high-frequency devices.
Designing CuSe-gCN nanocomposite as an active electrocatalyst for water oxidation
Alharbi Fatemah Farraj,Ahmad Zahoor,Chughtai Adeel Hussain,Khosa Rabia Yasmin,Farid Hafiz Muhammad Tahir 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
CuSe-gCN nanocrystals were premeditated and produced utilizing a simple hydrothermal method. Different analytical techniques well characterized the generated samples. The prepared samples also contain nanocrystals with a vertical shape, decorated with numerous nanoparticles. All characterizations confirm the phase composition of composite CuSe-gCN. The pore size of the N2 adsorption-desorption isotherm also pointed to a mesoporous structure. Furthermore, the combination of distinct morphology nanoparticles embellished on gCN graphitized nanotubes helps to achieve larger current densities and lower starting potentials for the oxygen evolution process. Because of their unique mesoporous structure, the CuSe-gCN catalysts show exceptional electrical conductivity and electrocatalytic activity. Compared to monometallic CuSe and gCN, CuSe-gCN significantly lower overpotential of 208 mV was needed to obtain a current density of 10 mA/cm2. The CuSe-gCN nanocrystals displayed good stability and a low Tafel slope of 35 mV/dec. This research shows that it is possible to use a copper-based selenide with gCN and combine all the beneficial characteristics in a single catalyst system.. Still, it also offers fresh perspectives on the logical proposal and creation of effective electrocatalysts for various applications.